I have had the occasions when my seatbelts stick in an extended position for anywhere form five minutes to 24 hours. If I pull fast they can stick. It is really bad if I am out and can’t buckle up or if it happens to my wife on the passenger side. What is the problem?

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si